<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
#div1 { width:100px; height:100px; background:#FFC; border-radius:20px; box-shadow:10px 20px 5px #ccc; }
</style>
</head>

<body>

<div id="div1"></div>

</body>
</html>
